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Respiratory system of cockroach I. ...

Respiratory system of cockroach
I. consists of tracheae, tracheoles and spiracles.
II. are coordinates and regulated by nerve centres in thoracic genglia which are stimulated by low `O_ 2 ` and higher ` CO _ 2 ` concentration in tissue fluids.
III. contains mainly four types of cells trophocytes, mycetocytes, oenocytes and urate cells.
IV. is open or lacunar type.
Choose the option for the correct statements.

A

I, II and III

B

I and II

C

II and IV

D

I and III

Text Solution

Verified by Experts

The correct Answer is:
B
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